Improvement in stop-valves



J. L. PEAKE. STOP VALVE. No. 113,337.

Tu: mams Penas en. monklma, wmmomn. n, c.

Patented Amr. 4, 1871.

bien (tuin.

aan sala .J'OHNyLQ 'PEAKR OFNEW YORK, NQY.

Letters Patent No. 113,337, dated April 4, 1871.

IMPROVEMENT in s'roP-vALves.

.'Lhe-Elchedule referred to in thee'Lettex's Patent and making part ofthe same.

To all ivhom it may concern Be'it known that I, JOHNA L. PEAKE, of thecity .and county of New York, in the State of New York,

cut their way into any dirtwhich may lodge in. the

space below,` and I provide-a Vliberal space in which, such dislodgeddirt may lie during the time while the vvalve is shut. On the opening ofthe valve the current of water, steam, or other duid dislodges andwashes away the dirt.

In cases where, as usual, the duid is received on one side anddischarged on the opposite side, there may be but two of these gates,one covering the receiving and the other the discharging side; but Ican, inlarge valves Yof this class, divide the receiving-orifices intotwo or more, and the discharging-orifice, being similarly divided, I canemploy a corresponding number of separate gates with the iixed wedges todrive them outward as they descend. In cases where there are three ormore separate pipes or corresponding connections it is proper to providealways a corresponding number of these separate gates.`

The nearest previous approximations to my coustrnction have employedelastic cylindrical gates ex-l tending nearly around in one piece, witha xed wedge received in the opening. Such construction requires adelicate adaptation of the elasticity and strength to inlh'll 'theconditions required,and the action is, at the best, imperectlydistributed. When the wedge opens he springy e-yiindrical gate, itinduces a kind of side movement arcund alarge portion ci" the periphery,and, whether this is greatly resisted by friction or not, itis certainto the surfaces. Along lines a little distant from the wedges thepressure will be very great, while opposite 'to the wedges it will bealmost inappreciable.

My invention induces a 'nearly perfect distribution of thc'pressnre andwear.

I will proceed to describe what I consider the best means of carryingont the invention.

`The accompanyingdrawing forms a part of this,

specilication.

Figure I s a central vertical section.

Figurp is a horizontal section on the lineS S in 'gSimila-r letters ofreference indicate like parts in both the figures.

A is the casting which forms the main casing. It

is internally threaded to receive pipes at opposite induce unequalpressure and wear ofsides, and to receive the proper-threaded cap B atlthe upper side, which has a suitable internal thread and studng-boxesto carry the partially-threaded and partially-smooth screw-stem G withits hand-wheel c.

, The lower'end of the screw C carries alipped collar,

0, which is adapted, by the aid of a nut, C, to take hold of lippedinternal projections from the gates'and compel them to rise and sinkwith the screw, while they are at liberty tomove outward and inwardwithin moderate limits.

Ai A1 are tapering wedges, accurately finished by machineryor-otherwise, and secured in the positions represented by rivets A? A.

Internal lips or extended surfaces a are provided around the orifices,which communicate with the pipe nozzles on each side.

Dl D2 are separate gates, nicely turned or otherwise nicely nished to acylindrical surface on. the exterior,

and provided with lipped internal projections dl (l2, f 4'adapted to beengaged by the lipped projections on the screw, as represented. Theedges of the gates Dl D2 are finished in a planing-machine, orotherwise, so as to present true surfaces.

Now, when the screw@ is adj usted to hold the gates D1 D2 at aproperelevation, the passaggi-om onepipc to the other is openfan'd the steamor other fluid moves freely through the structure. Under theseconditions the gates D D yieid slightly by the Yslay aiibrdcd at theirconnection with theA screw f8, there is no appreciable friction teretard their ascenA or descent.

IVhen, by the turning of the screw G, the gates are depressed, theymaintain the same condition, slightly deflected by thc current oi'-water across 'their lower edges until they approach their lowestpositions. lien their edges begin t be guided forcibly by the wedgesAl.. These press them strongly and evenly cutrrrd against the seats a,and. at length the fnrt'ncr turning `of the screw C is arrested by theresistance due to the forcible pressing of these gates DI* I): against'the faces a by the action of the wedges A' A?.

rlhe connections d d2 are at about the middle heights of the gates I)xD2. The screw G, with its not U2, extends alittle below these, leaving alarge empty space within and above the lower edge-fJ of. the gates. Thisspace is ample to accommodate sand, scales of rust, or other foreignmatter, whif: I denominate by the collective term dii-t, which may havegathered from any canse in the bottom of the structure. In cases wherewater loaded with fercign matter has moved at a very moderate ratethrough the structure for a long time, it may chance that the entireoaiity below the passages is filled with densely-packed earth y or`mineral matter. This might intcriere with the descent 'of the gatesexceptfor the sharpening of their lower edges and the ample spaceprovided for thedis'- Alodging of such foreign material adjacent to thesnrfaces'a. The stn' thus dislodged by the sharp edges and crowdedinward toward the axial Iline, ofthe screw C, rests there until thegates Dl D2 are' again lifted,

when it will 'be immediately washed or driven away,

Z`vif vthere is'any considerable force in the motion of the iuid.4 l A,Ihave shown the wedges A1 as joined to the part A'byseparate rivets.'rlhey may be joined by rivet-v ing (o'r similarly npsetting)projeotions'tormed on either of the parts, and 'made to applyin'correspondng holes in the other. I believe it possible, with suitabletools,

to tnishthe edges of the wedges with perfection and form the wedges A inone piece with thecasi'ng A.

4In caseswhere, from anyv cause,'the gates D, 8m., are not forcedperfectly home against the adjacent' surface by the wedges A1, my valvepacks itself, by

the pressure ofthe steam or other duid on its interior` I' This iseifected by reason' of the-'ready yielding of the parts D I)2realativelyto each other and to theoperating stem O. @Bhe steam Aorother uid meeting. the first gate presses it alittle `inward and'lls theinterior of the valve to a tension 'about eqnal'to that in thereceiving-pipe. But the pressure thereby in- Iduced in the interior ofthe valve, tol wit, in the space the water-passages and to the surfacesa, as herein set forth.

`2. The gates Dl D, made with the lower edges thin and sharp, so as tocut into'and dislodge any accumulation of solid matter in the cavity atthe base and allow it to be retained in the space provided below theconnection to the stem C, and be carried away by the current onopeningthe valve, as set forth.

In testimony whereof I have hereunto set my name inpresence of twosubscribing Witnesses.

' JOHN L. PEAlE. Witnesses:

TnoMAs D. S'rn'rsorr, O. O. LIvmGs.

